turbo'ing my 1HZ troopcarrier

hey guys,

I have a 2004 HZJ78 series landcruiser and I'm looking at getting more power out of the engine, what have you found works and doesn't work? I am a third year apprentice carpenter and have looked at many old forums but I'm wondering if there is anything new out there that is cost effective?

I have looked into denco turbo kits with full exhuast systems which will cost 3.5 grand but needs installing, has anyone installed these systems?

There are occasionally 2nd hand kits which come up on ebay aswell, has anyone gone down this path? what were your experiences with this?

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Reply By: Flighty ( WA ) - Monday, Aug 13, 2012 at 14:52

Monday, Aug 13, 2012 at 14:52
My last cruiser ( 1996 75 series trayback ) presented the same questions you are asking now.
My solution was to replace the engine complete with a 1HDT unit from a jap importer of 1/4 cut units
The price paid was $ 10,000 inc GST + fitting but had to run a new brake vacuum line, replace air cleaner top and fit heavy duty clutch plus remove my existing extractors.
The plus of doing it this way is the bottom end is stronger, the 1/4 cut imports are usually reasonably low km ( mine was @ 89k ) and most important is engine is all ready to go with profound improvement all round
The other added incentive is I sold my old motor for $3,500 so the overall cost was quite reasonable.
The adage that they are not compatible in Australia is rubbish after the 6 years I kept it there were zero problems with fuel or any other issues whatsoever, and that covered over 170,000 k around WA loaded with work gear.
Hope it helps with your quest for a bit more grunt.
Cheers & Regards

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AnswerID: 492818

Follow Up By: Patrick B1 - Wednesday, Aug 15, 2012 at 23:11

Wednesday, Aug 15, 2012 at 23:11
i had a 105 1hz and turbo it had all the problems in the world. end up putting 1hdt in brand new out off crate 8g + new injector pump clutch labour all up 12g my advice to any one never turbo a1hz.
FollowupID: 768559

Reply By: racinrob - Monday, Aug 13, 2012 at 16:37

Monday, Aug 13, 2012 at 16:37
After a lot of deliberation I fitted an after market water cooled turbo 200,000 kms ago to my 1HZJ75, didn't get much change out of $4K but think now it was money well spent. You won't get the fuel savings they claim but the improvement in towing and general performance is well worth it.
AnswerID: 492821

Reply By: Member - Shane D (QLD) - Monday, Aug 13, 2012 at 18:43

Monday, Aug 13, 2012 at 18:43
I did my '05 HZJ105 a few months back and I'm very happy with it.

We've recently done 7241 ks in 3 weeks towing a Jayco swan camper van with enough winter gear for 3 adults and 3 kids, fridge full, both fuel tanks full, gross weight a little under 5 tons.

I hadn't taken the swan far, never with as many people/gear on an extended trip so I have no idea how it would be on fuel pre turbo, on short trips I did It seemed pretty bad, but no real numbers to work with.

Fuel economy?, when pushed with cross winds, head winds, at freeway speeds, it was around 17-18 liters/100 ks, backed off to 85/90 kph and the it dropped to about mid 14's.
Its never used so much, but as sated, I haven't towed the van any real distance so i cant really judge, It did come very clear that by backing off a bit saved heaps in fuel

Performance?, It hold the hills as good if not marginally better now loaded up with c/van on the back, then it did before hand with just me in it pre turbo.
With just me and nothing in the back, it goes real well, still not suited for the traffic light drags but when it comes to a hill, it just knuckles down, that's torque, that's what I've gained the most, that's what gets it up the hills.

Running around Urban Brisbane as a work hack and school runner, with little freeway time its using 13-14/ 100ks, marginally better than before, but driven conservatively (real hard to do now), if you want to play you will pay at the pump.

I got little change out of $6K, but instal included full dyno, new injectors, pump timing, filters, full 3 inch beaudesert exhaust, valve shims adjustments, basically a bloody good tune, which is what it really needed.

I've had to adjust my driving to suit, no more having the put the foot to the floor from second gear up, just needs a gentle touch now, Its been set up for power and will over fuel making lots of black smoke when not in boost, but once IN boost, different story.
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Turbo begins to spool at 1000 rpm, full boost at 1800 rpm (also peak torque),
Its has lots of lag the lower in the rev range, but has virtually nil lag once above 2000 rpm, put the foot down and goes straight away.


AnswerID: 492832

Follow Up By: Member - Shane D (QLD) - Monday, Aug 13, 2012 at 18:46

Monday, Aug 13, 2012 at 18:46
Sorry if you get a sore neck looking at that' side on.
FollowupID: 768452

Follow Up By: harry j - Monday, Aug 13, 2012 at 19:53

Monday, Aug 13, 2012 at 19:53
thanks for the post,

I am quite amazed at how much 25% power increase can affect the truck from struggling to keep up with busses to being in the fast lane. why did you go 3 inch over the 2.5 exhaust that comes in the kit? i was assuming that they would be putting these kits out with enough flow from 2.5inch to more than handle the turbo.
FollowupID: 768461

Follow Up By: Member - Shane D (QLD) - Wednesday, Aug 15, 2012 at 18:00

Wednesday, Aug 15, 2012 at 18:00
I was sort of up sized to a 3 inch when I dropped the vehicle off, it added $400 to the installation, the specialist made it clear that the 2.5 inch system was adequate but the difference being that I would get better throttle response and better heat dissipation from the turbo with a bigger system, only marginal gains in power if any at all.
One other thing and this is important, The 3 inch gave the cruiser a deeper note out the back, not louder, just. . . . . ., um . . . . . . . more MANLY, there, I said it.

I was talked out of spending $$$ on EGT's and boost gauges by the specialist, He told me the only gauge I needed to be focused on was the water temp gauge, the T28 Garett is water cooled he also includes a low water alarm as part of the installation, if the motor fails because of no coolant then so will the Turbo, as afr as temps goes, Turbo will only get hot if left at full throttle at low RPM's for extented periods, it also has an internal wastegate, it won't over boost

Also Mine has been set at 10 psi boost.
FollowupID: 768538

Reply By: harry j - Monday, Aug 13, 2012 at 19:46

Monday, Aug 13, 2012 at 19:46
thanks for the replies guys,

would love to put a factory turbo motor in but at 10 grand minus what i get for my moter it is well outside the budget.

The denco turbo kit comes with a 2.5 inch exhaust and most people on the forum are saying the 3 inch is the go but i am only looking for the 7-8 pound boost mark. will the 2.5 be heaps for this or is it really worth hunting the 3 inch?
AnswerID: 492841

Reply By: KevKim37 - Monday, Aug 13, 2012 at 22:57

Monday, Aug 13, 2012 at 22:57
Hi Shane ,

I had a boost compensator fitted with my AXT Turbo system and when adjusted properly there was little smoke but similar power as against when first fitted by agent. He just screwed fuel setting for a certain amount of smoke on acceleration which caused excessive oil sludging, engine noise and heavier fuel consumption. I have seen some Denco systems without this compensator which can be set to bring fuel on earlier to give a better low down response and/or earlier boost.
Cheers Kev.
AnswerID: 492856

Reply By: KevKim37 - Monday, Aug 13, 2012 at 23:07

Monday, Aug 13, 2012 at 23:07
Hi Harry J,

I would definitely go the 3" mandrel exhaust for the 4.2l engine and also set up EGT gauge and Boost gauge for safety reasons. I have used these on the last three of my vehicles and still use them on my factory turbo 1HDTFE 6cyl with Gas and 3" system as I have upgraded GVM of HDJ79 Ute and tow 3.5 tonne van.

Cheers Kev.
AnswerID: 492857

Reply By: harry j - Wednesday, Aug 15, 2012 at 13:14

Wednesday, Aug 15, 2012 at 13:14
Cheers Kev,

I've just been quoted approx $1500 for fitment and dyno tune.
Is this a fair price or should I be getting it cheaper elsewhere?

AnswerID: 492915

Reply By: KevKim37 - Wednesday, Aug 15, 2012 at 16:42

Wednesday, Aug 15, 2012 at 16:42
Hi Again Harry j,

Does that include the gauges I mentioned also.
AnswerID: 492926

Follow Up By: KevKim37 - Wednesday, Aug 15, 2012 at 16:55

Wednesday, Aug 15, 2012 at 16:55
Reason I asked about gauges is because with the exhaust fitting and dyno testing I have paid only minimal dollars as have friends in the game in Cairns and not sure of retail prices for these services. As for the gauges I have fitted myself as most good exhausts come with an after turbo fitting in dump pipe, so just screw in, mount gauge and wire up. Boost gauge just as easy if you have electrical and/or mechanical abilities.

Cheers kev.
FollowupID: 768532

Follow Up By: harry j - Friday, Aug 17, 2012 at 07:27

Friday, Aug 17, 2012 at 07:27
No that price doesn't include gauges, I've done some more ringing around and found out that denco will install it for $700, only problem is there 5 hours away. I think I will get gauges and install them myself if they recommend it. Thanks for the posts Harry
FollowupID: 768632

Reply By: wr450tractor - Wednesday, Aug 15, 2012 at 19:31

Wednesday, Aug 15, 2012 at 19:31

I fitted a Denco turbo kit to my 1HZ 2004 2 men 8 hrs with gauges
it is not a big job the difference to the cruiser is nothing short of unbelievable
everything you need comes in the kit and just bolts on

cheers george
AnswerID: 492941

Follow Up By: harry j - Wednesday, Aug 15, 2012 at 20:52

Wednesday, Aug 15, 2012 at 20:52
I was thinking of doing the Job myself but not confident in drilling into the sump and tapping
The oil line but the rest sounds achievable, have you got any pointers on the install if I do try it myself?

Cheers harry
FollowupID: 768551

Follow Up By: wr450tractor - Thursday, Aug 16, 2012 at 22:45

Thursday, Aug 16, 2012 at 22:45
I welded mine in as for the rest it, it just all bolts together the denco kit is so good
you get everything you need just about anyone could do it
FollowupID: 768626

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